A tightly-packed crowd of people, especially photographers, journalists and cameramen, covering a news story.
A chaotic situation where some effort has gone thoroughly wrong; a fiasco or clusterfuck.
A disorderly pile of people formed by jumping upon a victim.
To jump into such a pile.
To cause a group of people to lie in a pile upon another, originally as a punishment to the victim on the bottom.
To act similarly with regard to residential density: to live or cause to live in high-density settlements.